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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23f276d3f194ea41959c2ee5b60e9928111f181f16f4d1ef0ef28701bc77f40' 
  AND token = '9PCsQ7YH54hcoNo0lMV+kDEB6tUR3PQHAHvkIqTbrp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}